Movement variability and limb loading symmetry during simulated daily functional tasks.

Area of Science:

• Biomechanics
• Motor Control
• Human Movement Analysis

Background:

• Movement variability is key to understanding motor skill performance and coordination.
• Assessing movement variability and load symmetry provides insights into biomechanical differences during various tasks.

Purpose of the Study:

• To investigate how task type and sex assigned at birth influence movement variability and load symmetry in young adults.
• To test the hypothesis that variability and symmetry would not differ between sexes or tasks.

Main Methods:

• Measured peak impact force (PIF) and average loading rate (ALR) using loadsol® sensors.
• Analyzed data from 39 females and 33 males performing level walking, stair ascent/descent, and sit-to-stand.
• Utilized coefficients of variation (CV) and Absolute Symmetry Index (ASI) to assess variability and symmetry.

Main Results:

• Significant differences in PIF and ALR were found between tasks, but not significantly between sexes.
• Sit-to-stand task showed clinically meaningful differences in PIF ASI compared to other tasks.
• ALR and ALR ASI also differed significantly between tasks, with most differences being clinically meaningful.

Conclusions:

• Movement variability differs significantly across various daily tasks, likely due to distinct motor control strategies and base-of-support requirements.
• Task-specific movement patterns identified through variability analysis can inform the understanding of potential injury risk factors.
• Sex assigned at birth did not significantly impact the measured movement variability or load symmetry metrics in this cohort.